For subtitle support, you can extract vsfilter.dll from the 64-bit K-Lite Codec Pack, move it to your plugins64 folder, and rename it to a .vdf extension.
For a fast setup, focus on these essential downloads to extend your 64-bit capabilities: virtualdub 64 bit plugins download
The official SourceForge page provides the base V1.10.4 (x64 / 64-bit) release. For subtitle support, you can extract vsfilter
For professional-grade noise reduction, Neat Video for VirtualDub offers a dedicated 64-bit installer that places the NeatVideo4.vdf file directly into your subfolder. Where to Find Individual 64-Bit Filters For subtitle support